擅长:python、mysql、java
<p>我在你链接的页面上找到了一个关于答案的提示:</p>
<blockquote>
<p>In versions of Python prior to 2.2,
you could not directly subclass
built-in datatypes like strings,
lists, and dictionaries. To compensate
for this, Python comes with wrapper
classes that mimic the behavior of
these built-in datatypes: UserString,
UserList, and UserDict. Using a
combination of normal and special
methods, the UserDict class does an
excellent imitation of a dictionary.
In Python 2.2 and later, you can
inherit classes directly from built-in
datatypes like dict.</p>
</blockquote>
<p>实际上,今天您可能希望将dict子类,而不是UserDict。在</p>